Punch and die mechanism for produc



G. A. BOLE El AL v 2,181,618

PUNCH AND DIE MECHANISM FOR PRODUCING PYROMETRIC CONES NOV. 28,

Filed July 50, 6

um M Z 7 Z c WW fi Patented Nov. 28, 1939 r UNITED STATES P TENT creme PUNCH AND DIE IVIECHANISM FOR'PRODUC- ING PYROMETRIC CONES George A. Bole and Harry E. Co Van, Columbus,

Ohio, assignors to Standard Pyrometric Cone Company, Columbus, Ohio, a corporation of v Ohio Application July 30, 1936, Serial No. 93,457

Fig. 6 is a plan view of the stationary die;

Fig. '7 is aside elevation of a cone formed by the apparatus comprising the presentinvention;

Fig. 8 is a perspective-view of said cone;

, Fig. 9 is a horizontal sectional view of the lower punch on the plane indicated by the line IX IX of Fig. 1.

Referring more particularly to the drawing, the numeral l designates an upper punch member, the numeral 2 the stationary die or block, and the numeral 3 the lower punch member. These members are adapted to be mounted in the standard frame of a tablet press (not shown) in substantially the arrangement disclosed. The die block 2 is formed with a substantially wedgeshaped slot 4 disposed in vertical registration with and adapted to receive the heads of the axially movable punch membersl and 3. In this instance, the block 2 is of circular form and has its outer peripheral edge portion provided with an annular groove 5, which is adapted for the reception of the end of a positioning screw 6 carried by the frame or bed of the press. By loosening the screw 6, the die block may be rotated axially so that the slot 4 provided therein may be properly aligned or registered with the heads of said punch members. Similarly, the punches are provided with circular stems 6a which are adjustably received within the sockets of movable holders and may be readily aligned with the slot of the die. n In this instance, the lower punch member 3 has the upper portion thereof provided with a metallic head I which, as shown in Fig. 9, partakes of the form of a right angle triangle when viewed in horizontal section, and conforms to the corresponding configuration of the slot 4 in the die block 2. Thus the head includes a flat vertical back surface 8, a front, vertically disposed surface 9 which extends at an acute angle to the plane of the back surface 8 so that the left side of the head I, as viewed in Fig. 1 or 9, is considerably thicker than the relatively reduced or thin right side thereof. The thicker end'of the head includes a fiat vertically disposed connecting surface II) which is slightly angular to a plane perpendicular to that of the surface 8. The upper end of the head 1 is beveled as at ii to produce a flat triangular surface, the surface l Ilying in aplane at an angleof approximately 30 degrees to the horizontal.

The upper punch member I provides a head l2 which is substantially the reverse of the lower head 1. Thus the head l2 inhorizontal cross section partakes of the form of a right angle 2 Claims.

This invention relates to the manufacture of pyrometric cones, a primary object thereof being to provide an improved punch and die mechanism for producing machine pressed cones characterized by their uniform straightness, dimensional accuracy, freedom from warpage or undesired distortion and accurately responsive to deformation when heated to definite, or predeter mined temperatures.

Another object of the invention resides in providing apparatus for producing such pyrometric cones, wherein the apparatus comprises a press having axially aligned, relatively movable upper and lower punch members and an associated stationary die member in which a slot is formed for the movable reception of the punch members, the latter being formed with angularly related cone-forming and pressing surfaces so arranged that when the punch members are forced together within the slot of the die, the substantially dry cone-forming materials will be subjected to uniformly applied forces of compression, whereby even distribution and compaction of said materials is effected to produce finished cones of uniform density and strength throughout the length thereof and of strict dimensiona1 accuracy.

A further object of the invention resides in so constructing the heads of the punch members, which are received within the slot of the stationary die member and closely conform to the transverse configuration of said slot, so that the stresses and forces created by the operation of the apparatus, will not break or injure the heads of the punch members or otherwise deleteriously affect the same.

The present application is a continuation-inpart of our prior application, Serial No. 54,606 filed Dec. 16, 1935.

For a further understanding of the invention, reference is to be had to the following description and the accompanying drawing wherein:

Fig. 1 is a perspective view of the cone forming members comprising the present invention;

Fig. 2 is a vertical sectional view taken through said members when the latter-are initially positioned to receive the cone-forming materials;

Fig. 3 is a similar view disclosing the upper and lower punch members in their pressing or coneforming positions;

Fig. 4 is a similar view disclosing the punch members separate and with the lower punch member elevated to effect the discharge of a formed cone;

Fig. 5 is a vertical transverse sectional view taken on the line VV of Fig. 3;

triangle and is closely receivable but movable within the walls of the slot 4 of the die block, conforming to the shape .of said walls. Further, the head l2 embodies a flat vertically disposed back surface l3 arranged in the same plane as the corresponding surface 8 of the lower head and disposed in registering relationship with the back wall 14 of the slot 4. The front surface 15 of the head I2 is disposed in acute angular relationship with the surface l3 and is united at the thicker side of the head by a connecting surface it. The surfaces l5 and I6 are disposed in registration with the corresponding surfaces 9 and it] of the lower head and with the complemental surfaces H and 18 of the die slot 4. The under portion of the head I 2 terminates in a flat angular or beveled surface I9 complemental to the surface I I of the lower head. The surface l9 may have inserted therein, in relief or intaglio, an identifying sign or symbol 20 for designating cone sizes.

In forming cones with the use of the present apparatus, the lower punch member is adjusted vertically so that when occupying its lowermost position, the beveled surface I! thereof will be disposed within the confines of the wedge-shaped slot l of the die block and below the upper surface of said block. This enables the slot 6 and the surface 8 of the head l to receive a regulated amount of the substantially dry, powdered materials from which a pyrometric cone, as indicated at H, is produced, such materials being placed in theupper end of the slot 4 until, without compaction, the upper portion of the slot, above the head l, is substantially filled with said materials in a manner even with the top of the die block. This enables said slot to receive a regulated amount'of the cone-forming material for each cycle of operation of the punches, the filling of the slot with such material usually being accomplished by an automatic feed mechanism, not shown. When the slot is so filled, the upper punch member is advanced vertically downwardly until the head l2 thereof enters the upper portion of the slot 4, with the lower punch member held stationary and until the complemental edges 22 of the punch heads meet, as shown in Fig. 5, the meeting of the edges 22 occurring within the confines of the slot '4.

Upon the completion of the compression" operation, both the lower and upper punch members are moved upwardly, as shown in Fig. 4, to facilitate the discharge of a pressed cone from the machine. The lower punch member advances upwardly so that the beveled surface ll thereof will be disposed above the upper horizontal surface of the block 2 and with the upper punch member vertically spaced therefrom. This enables a cone retained on the lower punch member to be readily accessible for either manual or automatic removal from the forming region of the press.

When the cones are removed from the press, they are substantially permanent in form so that they may be handled in the ordinary manner Without deformation or loss of dimensional accuracy. Such a cone may be used directly in the measuring of kiln heat effects or, if desired, may be subjected to heating for the purpose of further drying, hardening or calcining the same.

Cones, as shown at 2|, formed by the present apparatus, are characterized by their straight smooth side walls and freedom from distortion. By reason of the angular surfaces l0, l6 and 18, the base 23 of the cone, when positioned on a horizontal support, causes the longitudinal axis 24 of the cone to be disposed at an angle of 82 degrees with respect to the horizontal, so that the cone will be slightly tipped forwardly and thus in position to readily respond to predetermined heat effects in ceramic kilns, when the lower end thereof is normally embedded in a plastic receiving pad. Through the described construction of the punch members, the latter are rendered strong, substantial and durable and will withstand, without breakage, the severe conditions and complex forces of high pressures set up by the apparatus when in use in the pressing of cones. The heads of the punch members are devoid of regions of thin cross section which are so apt to break when forces of high pressure are applied thereto and it is particularly in this matter of providing punches of substantial, practicable and durable construction that distinguishes the present invention from the disclosures set forth in our aforesaid prior application.

What is claimed is:

'1. Apparatus for forming pyrometric cones comprising a die block provided with a vertical slot substantially triangular in transverse cross section, bevelled upper and lower rigid punch members of corresponding cross sectional formation arranged for sliding movement in said slot, the longitudinal edges on one side of the opposing faces of said punches being disposed in parallel relationship, the other longitudinal edges of said faces diverging from the narrower'part of said punches whereby when said punches meet in the slot in said die block, the opposing faces together with parts of the walls of said slot form a triangular pyramidal pocket.

2. In a press for producing pyrometric cones, the combination of a die-block having a slot therein bounded by side walls, the side walls of said slot defining in horizontal cross-section a .1

triangle composed of two elongated sides and a narrow base, a punch member in registration with and axially movable in the side walls of said slot, said punch member being constructed with sides which define a triangle in horizontal cross-section and corresponding to the said triangular cross section of the slot, the said punch member being operable to provide pressure to pyrometric cone forming material placed in said slot when in working engagement therewith through the medium of a contacting working surface on said punch member, the said working surface of said punch member being bevelled atan angle to the horizontal plane of the die-block, the bevelled surface being inclined at an angle to the said plane to provide the working surface in operative contact with material in the slot to press the same to produce a product with a bevelled surface angularly inclined to a horizontal plane as a result of the angular inclination of the said bevelled surface in coordination with the walls of the dieblock-slot.

GEORGE A. BOLE.

HARRY E. CO VAN. 

